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CRS804 DDQ

A compact 1U 400G switch built for AI clusters, storage fabrics, and high-speed aggregation, featuring four 400G QSFP56-DD ports, dual 10 Gigabit Ethernet, and RouterOS v7. With hot-swap power supplies, robust cooling, and low power consumption, it delivers ultra-high bandwidth, wire-speed performance, and future-proof scalability at an accessible price point.

Specification Find retailer

4x

400G QSFP56-DD ports

2x

1G/10G Ethernet ports

* QSFP-DD ports also support break-out modes to 1G/2.5G/5G/10G/25G/50G

CRS804 DDQ is the practical and cost-effective approach to

400 Gigabit speeds, AI, and future-proofing.

4 GB of RAM

Quad-core 2 GHz ARM CPU

Dual-redundanthot-swap power supplies

2x hot-swap cooling fans

RouterOS v7

Reach wire-speed on all ports

with the mighty Marvell switch-chip!

The CRS804 DDQ is a compact and reliable 400 Gigabit switch designed for modern AI workloads and next-generation network upgrades. With four 400G QSFP-DD ports and dual 1/10G Ethernet, it delivers exceptional bandwidth density in a quiet and efficient 1U form factor.

Inside, a Marvell 98DX7335 switch chip works together with a hefty quad-core 2.0 GHz ARM CPU, 4 GB of DDR4 RAM, and RouterOS v7. This provides advanced traffic control, high performance switching, and a familiar management environment trusted by users worldwide.

The CRS804 DDQ is designed for long-term reliability and low cost of ownership, supported by hot-swap power supplies (included!), robust cooling, and low power consumption that reaches only 123 W at full load with optics installed.

Where does it fit

AI and GPU clusters

A perfect building block for small to medium AI installations. It delivers predictable, low-latency performance and full wire-speed switching, keeping GPU nodes and storage traffic flowing without bottlenecks. The compact design and low power usage make it suitable for AI labs, research environments, and smaller rack deployments.

Future proofing for existing networks

The CRS804 DDQ can act as a high speed core or aggregation switch even in older racks. Each 400G QSFP-DD port is built from eight independent data lanes. This enables flexible breakout options, including two 200G links for AI workloads or lower-speed connections such as 100G or 40G. You can deploy the CRS804 DDQ in your existing network today and upgrade to higher speeds over time without replacing the switch. With the right breakout cables, the CRS804 DDQ can interconnect virtually any device with SFP or QSFP ports, regardless of generation.

All-flash storage fabrics

Use native 400G ports for fast storage uplinks or split them into dual 200G links. Ideal for media production, scientific workloads, and any environment where rapid data movement is essential.

Compact 400G fabrics in limited rack space

Create a powerful spine or backbone fabric using four 400G ports. Perfect for small datacenters, enterprise pods, edge compute installations, and environments where traditional 400G equipment would be too loud, too large, or too expensive.

CRS804 DDQ

Specification

Specifications

Product code CRS804-4DDQ-hRM
Suggested price $1,295.00
Architecture ARM 64bit
CPU AL52400
CPU core count 4
CPU nominal frequency 2000 MHz
CPU Threads count 4
Switch chip model 98DX7335
RouterOS license 6
Operating System RouterOS v7
Size of RAM 4 GB
Storage size 512 MB
Storage type NAND
MTBF Approximately 200'000 hours at 25C
Tested ambient temperature -10°C to 60°C

Powering

Number of AC inputs 2
AC input range 100-240
Frequency (Hz) 50-60
Max power consumption 123 W
Max power consumption without attachments 92 W
Cooling type 2 fans

Ethernet

Number of 1G/2.5G/5G/10G Ethernet ports 2 (supported: 10M/100M/1G/10G)
Number of 400G QSFP56-DD ports 4

Peripherals

Serial console port RJ45

Other

CPU temperature monitor Yes
PCB temperature monitor Yes
Voltage Monitor Yes

Certification & Approvals

Certification CE, EAC, ROHS
IP 20

Included parts

Note

The device has an operating system preinstalled and licensed. No separate purchase is necessary and the product is ready to use. The device includes free software updates for the life of the product or a minimum of 5 years starting from date of purchase.

CRS804-4DDQ-hRM
Mode	Configuration	1518 byte		512 byte		64 byte
Mode	Configuration	kpps	Mbps	kpps	Mbps	kpps	Mbps
Switching	Non blocking Layer 2 throughput	131752.3	1600000.0	390625.0	1600000.0	810000.0	414720.0
Switching	Non blocking Layer 2 capacity	131752.3	3200000.0	390625.0	3200000.0	810000.0	829440.0
Switching	Non blocking Layer 1 throughput	131752.3	1621080.2	390625.0	1662500.0	810000.0	544320.0
Switching	Non blocking Layer 1 capacity	131752.3	3242160.4	390625.0	3325000.0	810000.0	1088640.0
Routing	none (L3HW)	130643.6	1586535.8	387536.3	1587348.6	810000.0	414720.0

CRS804-4DDQ-hRM		AL52400 - all port test
Mode	Configuration	1518 byte		512 byte		64 byte
Mode	Configuration	kpps	Mbps	kpps	Mbps	kpps	Mbps
Bridging	none (fast path)	2416.8	29349.6	6404.6	26233.2	9392.5	5109.5
Bridging	25 bridge filter rules	1191.3	14467.1	1200.5	4917.2	1196.2	650.7
Routing	none (fast path)	2414.7	29324.1	6392.2	26182.5	9617.2	5231.8
Routing	25 simple queues	1133.2	13761.6	1144.8	4689.1	1130.3	614.9
Routing	25 ip filter rules	717.4	8712.1	711.1	2912.7	701.8	381.8

All tests are done with Xena Networks specialized test equipment (XenaBay),and done according to RFC2544 (Xena2544)
Max throughput is determined with 30+ second attempts with 0,1% packet loss tolerance in 64, 512, 1518 byte packet sizes
Test results show device maximum performance, and are reached using mentioned hardware and software configuration, different configurations most likely will result in lower results